.navbar-default{
    border: none !important;
    background-color: white !important;
    height: 50px !important;
    margin: 0 !important;
  }#nav {
    height: 50px;
  }
  #nav h1 {
    color: rgb(253, 168, 87);
    margin-top: 5px;
    padding: 0;
  }
  #nav h4{
    margin-left: 10px;
    margin-top: 20px;
    color: black;
    font-size: 18px;
  }
  .formbg{
    background-color: rgba(255, 255, 255, 0.63);
    /* height: 420px; */
    margin-top: 3%;
    margin-bottom: 20px;
    position:static;
  }
  #operate4{
    /* height: 500px; */
    background: url(../images/op-bg.jpg);
    background-repeat: no-repeat;
    background-size: cover;
  }
  #operate4 input {
    margin-top: 30px;
  }
  .submit {
    margin-bottom: 20px;
    border-radius: 5px;
    border: none;
    background-color: rgb(59, 162, 226);
    color: white;
    width: 30%;
    height: 30px;
  }
  #footer {
    height: 100px;
    background-color: rgba(224, 224, 224, 0.514);
  }

  /*当文本框内容输入正确时，提示文本的样式*/
.ok_prompt {
  position: absolute;
  margin-left: 150px;
  margin-top: 3px;
  border: solid 1px #01be00;
  background: #e6fee4 url(../images/li_ok.gif) 5px 2px no-repeat;
  padding: 2px 5px 0px 25px;
  line-height: 20px;
}
/*当文本框内容不符合要求时，提示文本的样式*/
.error_prompt {
  position: absolute;
  margin-left: 135px;
  margin-top: 3px;
  border: solid 1px #ff3300;
  background: #fff2e5 url(../images/li_err.gif) 5px 2px no-repeat;
  padding: 2px 5px 0px 25px;
  line-height: 20px;
}